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首页> 外文期刊>Journal of Composites for Construction >Shear Strength of Fiber-Reinforced Polymer Reinforced Concrete Beams Subject to Unsymmetric Loading
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Shear Strength of Fiber-Reinforced Polymer Reinforced Concrete Beams Subject to Unsymmetric Loading

机译：非对称载荷作用下纤维增强聚合物混凝土梁的抗剪强度

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摘要

This study is concerned with the determination of the effects of shear span-to-depth ratio (a/d) and beam depth, or size, on the concrete contribution to the shear resistance of beams longitudinally reinforced with carbon fiber-reinforced polymer (CFRP) bars. One of the distinguishing features of the study is the unsymmetrical nature of the applied load, which creates two distinct a/d ratios in the same beam and allows the effect of the a/d ratio on shear strength to be clearly seen. Six simply supported large size CFRP reinforced concrete beams without shear reinforcement were tested, each under a single concentrated load. The test variables were the a/d ratio, varying from 1.0-11.5, and the beam depth varying from 200—500 mm. All the beams failed in shear, but the failure load and location for some of these beams could not be predicted by the shear design recommendations of American Concrete Institute (ACI) Committee 440. The reason is that these recommendations do not account for the effects of a/d and beam size on shear strength. Suggestions are made for the inclusion of these parameters in the shear design equations.
机译：这项研究与确定剪切跨度-深度比（a / d）和梁深度或尺寸对混凝土对碳纤维增强聚合物（CFRP）纵向增强梁的抗剪强度的影响的确定有关）吧。这项研究的显着特征之一是所施加载荷的不对称特性，它在同一根梁上产生两个不同的a / d比，并且可以清楚地看到a / d比对剪切强度的影响。测试了六根简单支撑的大尺寸CFRP钢筋混凝土无剪力梁，每个梁在单个集中荷载下进行试验。测试变量为a / d比，范围为1.0-11.5，光束深度为200-500 mm。所有梁均在剪切中失效，但是美国混凝土协会（ACI）委员会440的剪切设计建议无法预测其中某些梁的破坏载荷和位置。原因是这些建议并未考虑到梁的影响。 a / d和梁尺寸与抗剪强度有关。提出了将这些参数包括在剪切设计方程中的建议。

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